/*
 * Copyright (c) 2010, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "alkes/core/Stream.h"

namespace alkes {

Stream::Stream(Attributes attributes)
: attributes_(attributes)
{
}

Stream::~Stream()
{
}

void Stream::changeAttributes(Attributes attributes)
{
    attributes_ = attributes;
}

bool Stream::canSeek() const
{
    return 0 != (attributes_ & SEEKABLE);
}

bool Stream::canRead() const
{
    return 0 != (attributes_ & READABLE);
}

bool Stream::canWrite() const
{
    return 0 != (attributes_ & WRITABLE);
}

int64_t Stream::getLength()
{
    return onGetLength();
}

int64_t Stream::getPosition()
{
    return onGetPosition();
}

int32_t Stream::read(int32_t count, void* buffer, int32_t offset)
{
    if (0 < count && buffer && canRead())
        return onRead(count, buffer, offset);
    else
        return 0;
}

int32_t Stream::write(int32_t count, const void* buffer, int32_t offset)
{
    if (0 < count && buffer && canWrite())
        return onWrite(count, buffer, offset);
    else
        return 0;
}

int64_t Stream::seek(int64_t offset, SeekOrigin origin)
{
    if (canSeek())
        return onSeek(offset, origin);
    else
        return -1;
}

void Stream::flush()
{
    onFlush();
}

void Stream::close()
{
    onClose();
}

int64_t Stream::onGetLength()
{
    return 0;
}

int64_t Stream::onGetPosition()
{
    return 0;
}

int32_t Stream::onRead(int32_t /*count*/, void* /*buffer*/, int32_t /*offset*/)
{
    return 0;
}

int32_t Stream::onWrite(int32_t /*count*/, const void* /*buffer*/, int32_t /*offset*/)
{
    return 0;
}

int64_t Stream::onSeek(int64_t /*offset*/, SeekOrigin /*origin*/)
{
    return -1;
}

void Stream::onFlush()
{
}

void Stream::onClose()
{
}

}
